WO2005106288A1 - Method and device for pretensioning a belt drive of an internal combustion engine - Google Patents

Method and device for pretensioning a belt drive of an internal combustion engine Download PDF

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Publication number
WO2005106288A1
WO2005106288A1 PCT/EP2005/002045 EP2005002045W WO2005106288A1 WO 2005106288 A1 WO2005106288 A1 WO 2005106288A1 EP 2005002045 W EP2005002045 W EP 2005002045W WO 2005106288 A1 WO2005106288 A1 WO 2005106288A1
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WO
WIPO (PCT)
Prior art keywords
traction
strand
disc
traction mechanism
rotation
Prior art date
Application number
PCT/EP2005/002045
Other languages
German (de)
French (fr)
Inventor
Hermann Stief
Michael Bogner
Original Assignee
Schaeffler Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Kg filed Critical Schaeffler Kg
Priority to EP05715572A priority Critical patent/EP1730420B1/en
Priority to DE502005005400T priority patent/DE502005005400D1/en
Priority to KR1020067020264A priority patent/KR101140116B1/en
Publication of WO2005106288A1 publication Critical patent/WO2005106288A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1263—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially straight path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0806—Compression coil springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/18—Means for guiding or supporting belts, ropes, or chains

Definitions

  • the invention relates to a method for pretensioning a traction mechanism drive of an internal combustion engine, with a traction mechanism connecting at least the traction mechanism pulley of a crankshaft and the traction mechanism pulley of a starter generator, and with a tensioning device acting on the traction strand of the traction mechanism drive, with the starter generator being assumed to start that area of the traction means is understood to be that area of the traction means which is seen upstream of the traction means disc in the normal direction of rotation of the traction means disc of the starter generator, and that area of the traction means which is arranged downstream of the traction means disc of this starter generator is defined as an empty span.
  • the invention further relates to an apparatus for performing the method.
  • tensioning device on traction mechanism drives which, for example, consists of a tensioning roller which in turn acts spring-loaded on the traction mechanism drive.
  • This tensioning device acts predominantly in the area of the empty run of the traction mechanism drive, which arises during operation of the internal combustion engine, or which in Direction of rotation of the traction disk of the crankshaft of the internal combustion engine is arranged downstream of the traction disk of the crankshaft.
  • This arrangement of the tensioning device is intended to ensure that sufficient torque can be transmitted from the internal combustion engine via the traction mechanism drive.
  • a tensioning device is particularly noticeable when, in addition to the traction sheave of a crankshaft and the traction sheave of a starter generator, traction sheaves of auxiliary units, such as air conditioning compressor, servo pump and the like. a., are integrated in the traction drive.
  • the traction means strand referred to above as the empty strand changes to a traction strand, since this area of the traction means is pulled through the traction element disc of the starter generator during start operation, whereby the area of the traction device downstream of the starter-generator is in this case to be referred to as an empty strand.
  • the two tensioning rollers are connected to one another in a torsionally rigid manner, but are arranged on spring-loaded lever arms and, in the manner of a so-called pendulum tensioner, enable simultaneous pretensioning of the empty strand and tension strand which is set depending on the currently pending operating mode.
  • the invention is based on the object of specifying a method for pretensioning a traction mechanism drive of an internal combustion engine, which ensures a pretensioning of the traction mechanism drive with less mechanical or mechanical outlay, in particular effectively preventing any decrease in the pretensioning force in the idle strand during starter operation of the starter generator shall be.
  • Another object of the invention is to present a suitable device for carrying out this method.
  • the invention is based on a traction mechanism drive of an internal combustion engine, with a traction mechanism connecting at least the traction mechanism pulley of a crankshaft and the traction mechanism pulley of a starter generator, and with one the tensioning element of the traction device acting, with an assumed starter operation of the starter generator being understood as the traction area of the traction means which, viewed in the normal direction of rotation of the traction element disc of the starter generator, is arranged upstream of the traction element disc and the area of the traction element which is the empty strand is defined Traction device disc is subordinate.
  • the invention is based on the knowledge that the current position of the tensioning device after the internal combustion engine has been switched off, due to the internal friction of the internal combustion engine and the auxiliary units, and due to vibrations of the internal combustion engine during its shutdown process, can only be predicted to a very limited extent, and in this respect, one can be assumed Undefined pre-tensioning force in the traction device, which is adapted to the generator operation.
  • the object is now achieved according to the proposed method in such a way that the traction mechanism drive is pre-positioned in the same direction and counter to its normal direction of rotation immediately before the starting process or immediately after the internal combustion engine is switched off.
  • This measure allows the tension state built up in the empty and traction strand of the traction device to be stored in a defined manner over a longer period of time, that is to say at least until the next starting operation and beyond.
  • the fixing of the tensioning device should preferably be released again at least after the internal combustion engine has started, since the increased tension state of the traction mechanism drive or of the traction mechanism has an advantageous effect during the starting phase, but during normal operation of the drive arrangement, the traction mechanism drive (traction mechanism, storage of the traction mechanism and deflection disks ) would be subject to increased wear in this state.
  • the device for prestressing a traction mechanism drive of an internal combustion engine is characterized in accordance with claim 6 in particular in that the Starter generator is designed such that with this immediately before the starting process or immediately after switching off the internal combustion engine, a rotational movement of the traction device disk of the same against the normal direction of rotation of the traction device drive can be generated and, as a result, an increased tensile stress can be introduced into the empty run of the traction device, which has an elastic expansion of the traction device in the area of the empty run.
  • the starter generator is for
  • Generation of the rotational movement of the traction mechanism disc of the same is designed to be controllable counter to the normal direction of rotation of the traction mechanism drive.
  • the starter generator as an electric motor can briefly rotate in an opposite direction of rotation deviating from the normal direction of rotation by simple polarity reversal and accordingly apply a certain increased tensile stress to the empty run of the traction means.
  • the starter generator can also be assigned a separate drive which can be automatically engaged and disengaged into the tension means disk or its axis of rotation in order to generate the rotational movement of the tension means disk thereof counter to the normal direction of rotation.
  • the tensioning device is designed in such a way that an extension of the traction means in the region of the traction strand caused by the elastic expansion of the traction means in the region of the empty strand can be compensated. It is also proposed that the tensioning device is assigned a fixing means, with the aid of which the tensioning device can be fixed in this state following the compensation for the change in length of the tension strand.
  • the fixing means can be formed by a mechanical or electromechanical locking device or by a selected damping characteristic of the tensioning device.
  • fixation of the tensioning device be releasable.
  • Fig. 1 shows schematically a conventional traction drive of an internal combustion engine and a starter generator in the starting phase
  • FIG. 2 shows a traction mechanism drive designed according to the invention during its prepositioning before the actual starting process of the internal combustion engine.
  • the traction mechanism shown in Fig. 1 comprises a traction sheave 1 of a crankshaft of an internal combustion engine, a traction sheave 2 of a starter generator arranged downstream thereof in the normal direction of rotation (arrow direction) of the traction mechanism drive, as well as a deflection sheave 3 and a traction sheave 4 of an auxiliary unit, such as, for. B. an air conditioning compressor. All traction pulleys 1, 2, 4 and the deflection pulley 3 are connected to one another via a traction means 5, in the present case a belt or a chain.
  • the area upstream of the traction element disc 2 is known to be the traction strand 6 (the one in the normal direction of rotation of the traction element disc 2 (direction of arrow))
  • the area of the traction means 5) arranged on the left and the area of the traction means 5 arranged downstream and accordingly to the right of the pane 2 can be referred to as an empty strand 7.
  • a tensioning device 8 is arranged in the area of the mentioned strand 6, which in turn is designed as an axial tensioner and is supported at one end on a load-bearing component, not shown, for example the engine block. At the other end, the tensioning device 8 has a spring-loaded tensioning roller 9, which in turn is supported on the traction means 5, in the present case on the traction strand 6, and applies a certain prestressing force to the traction means 5.
  • the starter-generator acts as a starter, comparatively high forces can be recorded in the pull strand 6, since when the starting means pulley 2 of the starter-generator drags the pulley 1 of the crankshaft and the pulley 4 of the unit as well as the deflection disk 3.
  • the so-called drag torques for starting the crankshaft in particular are very high.
  • lower forces occur in the empty strand 7.
  • a decrease in the pretensioning force in the empty strand 7 and, on the other hand, a deflection of the tensioning device 8 outward in the direction of the arrow can be observed during the start of the starter generator.
  • the starter generator briefly produces a rotary movement of the traction element disk 2 counter to the normal direction of rotation; in the present case, accordingly, a counterclockwise rotation (arrow direction).
  • the starter-generator can be controlled accordingly by experiencing a brief reversal of the polarity of the energy connections, for example during the starting phase or immediately after the internal combustion engine has been switched off, and thus rotating as an electric motor counter to its usual direction of rotation. In the subsequent starting phase, the original polarity of the energy connections is restored and the starter generator can drive the internal combustion engine as intended.
  • the starter-generator for generating the rotary movement of the traction element disc 2 is assigned a separate drive that can be automatically engaged and disengaged against the traction element disc 2 or its axis of rotation (not shown in more detail).
  • an electrically operated linear drive can be provided with a lever system acting on the traction mechanism disc or its axis of rotation, which, contrary to the normal direction of rotation of the traction mechanism disc 2, realizes a positive fit between said drive and the traction mechanism disc 2 or its axis of rotation and a brief rotary movement counter to the normal direction of rotation and in Normal direction of rotation of the pulley 2 has a freewheel.
  • a lever system acting on the traction mechanism disc or its axis of rotation which, contrary to the normal direction of rotation of the traction mechanism disc 2, realizes a positive fit between said drive and the traction mechanism disc 2 or its axis of rotation and a brief rotary movement counter to the normal direction of rotation and in Normal direction of rotation of the pulley 2 has a freewheel.
  • the elastic expansion of the traction means 5 in the region of the empty strand 7 in turn causes an elongation of the traction strand 6, that is to say the region of the traction means 5 arranged on the left in the drawing.
  • This elongation of the traction strand 6 is compensated for by the tensioning device 8 by moving it in the direction of the arrow onto the Traction means 5 acts and penetrates into the traction mechanism drive.
  • the starter generator is initially operated as an electric motor or as a starter, which in turn is to start the internal combustion engine. If the starter generator or its traction means disc 2 rotates in the normal direction of rotation, an adverse drop in the pretensioning force in the empty strand 7 is now prevented, since the tensioning device 8 is still in the fixed state, which ensures an increased tension in the traction means 5.
  • the above exemplary embodiment is based on a tensioning device 8 in the form of an inertial tensioner.
  • tensioning devices 8 known per se can also be used according to the invention, for example so-called pendulum tensioners according to DE 100 45 143 A1, which advantageously relieves the stress on the lever arms by reducing the force peaks.

Abstract

The invention relates to a method and device for pretensioning a belt drive of an internal combustion engine, comprising: a belt (5), which connects at least the belt pulley (1) of a crankshaft and the belt pulley (2) of a starter-generator, and; a tensioning device (8) that acts upon the pulling strand (6) of the belt (5). During a hypothetical starting of the starter-generator, the area of the belt (5) defined as the pulling strand (6) is situated in front of the belt pulley (2) when viewing in a normal direction of rotation of the belt pulley (2) of the starter-generator, and the area of the belt (5) defined as the return strand (7) is situated behind the belt pulley (2). In order to effectively prevent, particularly during the starting operation, a possible drop in the pretensioning force in the return strand (7), the invention provides that the belt drive is pre-positioned immediately before the starting process or immediately after switching off the internal combustion engine by a defined introduction of torque into the belt drive and counter to its normal direction of rotation.

Description

Bezeichnung der Erfindung Name of the invention
Verfahren und Vorrichtung zum Vorspannen eines Zugmitteltriebs einer BrennkraftmaschineMethod and device for prestressing a traction mechanism drive of an internal combustion engine
Beschreibungdescription
Gebiet der ErfindungField of the Invention
Die Erfindung bezieht sich auf ein Verfahren zum Vorspannen eines Zugmitteltriebs einer Brennkraftmaschine, mit einem zumindest die Zugmittelscheibe einer Kurbelwelle und die Zugmittelscheibe eines Starter-Generators verbindenden Zugmittel sowie mit einer auf den Zugtrum des Zugmitteltriebs einwirkenden Spanneinrichtung, wobei bei einem angenommenen Starterbetrieb des Starter-Generators als Zugtrum derjenige Bereich des Zugmittels verstanden wird, welcher in Normaldrehrichtung der Zugmittelscheibe des Starter- Generators gesehen der Zugmittelscheibe vorgelagert ist, und als Leertrum derjenige Bereich des Zugmittels definiert ist, welcher der Zugmittelscheibe dieses Starter-Generators nachgeordnet ist. Die Erfindung betrifft ferner eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for pretensioning a traction mechanism drive of an internal combustion engine, with a traction mechanism connecting at least the traction mechanism pulley of a crankshaft and the traction mechanism pulley of a starter generator, and with a tensioning device acting on the traction strand of the traction mechanism drive, with the starter generator being assumed to start that area of the traction means is understood to be that area of the traction means which is seen upstream of the traction means disc in the normal direction of rotation of the traction means disc of the starter generator, and that area of the traction means which is arranged downstream of the traction means disc of this starter generator is defined as an empty span. The invention further relates to an apparatus for performing the method.
Hintergrund der ErfindungBackground of the Invention
Es ist an sich bekannt, an Zugmitteltrieben eine Spanneinrichtung zur Anwen- düng zu bringen, die beispielsweise aus einer Spannrolle besteht, die ihrerseits federbelastet auf den Zugmitteltrieb wirkt. Diese Spanneinrichtung wirkt überwiegend im Bereich des Leertrums des Zugmitteltriebs, welcher sich während des Betriebes der Brennkraftmaschine einstellt, beziehungsweise welcher in Drehrichtung der Zugmittelscheibe der Kurbelwelle der Brennkraftmaschine gesehen der Zugmittelscheibe der Kurbelwelle nachgeordnet ist.It is known per se to use a tensioning device on traction mechanism drives which, for example, consists of a tensioning roller which in turn acts spring-loaded on the traction mechanism drive. This tensioning device acts predominantly in the area of the empty run of the traction mechanism drive, which arises during operation of the internal combustion engine, or which in Direction of rotation of the traction disk of the crankshaft of the internal combustion engine is arranged downstream of the traction disk of the crankshaft.
Durch diese Anordnung der Spanneinrichtung soll gewährleistet werden, dass ausreichend Drehmoment von der Brennkraftmaschine über den Zugmitteltrieb übertragbar ist. Insoweit macht sich eine derartige Spanneinrichtung besonders dann vorteilhaft bemerkbar, wenn neben der Zugmittelscheibe einer Kurbelwelle und der Zugmittelscheibe eines Starter-Generators Zugmittelscheiben von Nebenaggregaten, wie Klimakompressor, Servopumpe u. a., in den Zugmittel- trieb eingebunden sind.This arrangement of the tensioning device is intended to ensure that sufficient torque can be transmitted from the internal combustion engine via the traction mechanism drive. In this regard, such a tensioning device is particularly noticeable when, in addition to the traction sheave of a crankshaft and the traction sheave of a starter generator, traction sheaves of auxiliary units, such as air conditioning compressor, servo pump and the like. a., are integrated in the traction drive.
Befindet sich der Zugmitteltrieb im Startbetrieb, bei dem die Brennkraftmaschine mittels des Starter-Generators gestartet wird, so wechselt der vorstehend als Leertrum bezeichnete Zugmitteltrum zu einem Zugtrum, da dieser Bereich des Zugmittels während des Startbetriebs durch die Zugmittelscheibe des Starter-Generators gezogen wird, wobei der dem Starter-Generator nachgeordnete Bereich des Zugmittels in diesem Fall als Leertrum zu bezeichnen ist.If the traction mechanism drive is in the start mode, in which the internal combustion engine is started by means of the starter generator, the traction means strand referred to above as the empty strand changes to a traction strand, since this area of the traction means is pulled through the traction element disc of the starter generator during start operation, whereby the area of the traction device downstream of the starter-generator is in this case to be referred to as an empty strand.
In der Praxis hat sich herausgestellt, dass sich, weil die aktuelle Position der Spanneinrichtung nach dem Abstellen der Brennkraftmaschine infolge der inneren Reibung der Brennkraftmaschine und der Nebenaggregate sowie infolge von Vibrationen der Brennkraftmaschine während des Abstellvorganges nur sehr bedingt vorhersehen lässt, eine schwankende und an den zuvor erfolgten generatorischen Betrieb des Starter-Generators angepasste Vorspannkraft im Zugmittel einstellt. Bringt der Starter-Generator während eines nunmehr folgenden Startvorgangs ein Drehmoment in den Zugmitteltrieb ein, so wird das Zugmittel vornehmlich im Bereich des sich einstellenden Zugtrums elastisch gedehnt und die Vorspannkraft im Leertrum fällt ab.In practice, it has been found that because the current position of the tensioning device after the internal combustion engine has been switched off due to the internal friction of the internal combustion engine and the auxiliary units and due to vibrations of the internal combustion engine during the shutdown process can only be predicted to a very limited extent, a fluctuating and at the previously adjusted generator operation of the starter generator adjusts the pretensioning force in the traction mechanism. If the starter-generator introduces a torque into the traction mechanism drive during a subsequent starting process, the traction mechanism is stretched elastically primarily in the area of the traction strand which arises and the pretensioning force in the empty strand drops.
Gerade für den Startbetrieb muss dieser Abfall der Vorspannkraft im Leertrum, der sich besonders nachteilig bei Riementrieben bemerkbar macht, verhindert werden, um eine ausreichende Drehmomentübertragung insbesondere auf die Zugmittelscheibe der Brennkraftmaschine bewerkstelligen zu können. Um der vorstehend beschriebenen Problematik zu begegnen, ist es aus der DE 100 45 143 A1 bekannt, den Wechsel des Leertrums und des Zugtrums im Zugmittel mittels einer Spanneinrichtung mit zwei Spannrollen zu begegnen, die in dieser hierin als Riemenscheiben bezeichnet werden. Im wesentlichen sind die beiden Spannrollen miteinander drehstarr verbundenen, jedoch an federbelasteten Hebelarmen angeordnet und ermöglichen nach Art eines sogenannten Pendelspanners ein gleichzeitiges Vorspannen des sich jeweils abhängig vom aktuell anstehenden Betriebsmodus einstellenden Leertrums und Zugtrums.Especially for starting operation, this drop in the pretensioning force in the empty run, which is particularly disadvantageous in belt drives, must be prevented in order to be able to achieve sufficient torque transmission, in particular to the traction sheave of the internal combustion engine. In order to counter the problem described above, it is known from DE 100 45 143 A1 to counter the change of the empty run and the pull run in the traction means by means of a tensioning device with two tensioning rollers, which are referred to herein as pulleys. Essentially, the two tensioning rollers are connected to one another in a torsionally rigid manner, but are arranged on spring-loaded lever arms and, in the manner of a so-called pendulum tensioner, enable simultaneous pretensioning of the empty strand and tension strand which is set depending on the currently pending operating mode.
Sicherlich ist durch diese Maßnahme ein vorteilhafter Effekt hinsichtlich der Verspannung des Zugmitteltriebs zu verzeichnen. Aufgrund der Tatsache, dass die Spanneinrichtung sowohl auf den sich einstellenden Leertrum als auch auf den Zugtrum einwirkt, baut diese relativ groß, welches bei beengten Verhältnissen im Motorraum eines Kraftfahrzeugs zu Problemen führen kann.This measure certainly has an advantageous effect on the tensioning of the traction mechanism drive. Due to the fact that the tensioning device acts both on the resulting empty run and on the train run, it builds relatively large, which can lead to problems in the tight space in the engine compartment of a motor vehicle.
Aufgabe der ErfindungObject of the invention
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Vorspannen eines Zugmitteltriebs einer Brennkraftmaschine anzugeben, welches mit geringerem maschinentechnischen beziehungsweise mechanischem Aufwand eine Vorspannung des Zugmitteltriebs gewährleistet, wobei insbesondere während eines Starterbetriebs des Starter-Generators ein etwaiger Abfall der Vorspann- kraft im Leertrum wirkungsvoll verhindert werden soll. Aufgabe der Erfindung ist es ferner, eine geeignete Vorrichtung zur Durchführung dieses Verfahrens vorzustellen.The invention is based on the object of specifying a method for pretensioning a traction mechanism drive of an internal combustion engine, which ensures a pretensioning of the traction mechanism drive with less mechanical or mechanical outlay, in particular effectively preventing any decrease in the pretensioning force in the idle strand during starter operation of the starter generator shall be. Another object of the invention is to present a suitable device for carrying out this method.
Zusammenfassung der ErfindungSummary of the invention
Die Erfindung geht aus von einem Zugmitteltrieb einer Brennkraftmaschine, mit einem zumindest die Zugmittelscheibe einer Kurbelwelle und die Zugmittelscheibe eines Starter-Generators verbindenden Zugmittel, sowie mit einer auf den Zugtrum des Zugmittels einwirkenden Spanneinrichtung, wobei bei einem angenommenen Starterbetrieb des Starter-Generators als Zugtrum der Bereich des Zugmittels verstanden wird, welcher in Normaldrehrichtung der Zugmittelscheibe des Starter-Generators gesehen der Zugmittelscheibe vorgeordnet und als Leertrum der Bereich des Zugmittels definiert wird, welcher der Zugmittelscheibe nachgeordnet ist.The invention is based on a traction mechanism drive of an internal combustion engine, with a traction mechanism connecting at least the traction mechanism pulley of a crankshaft and the traction mechanism pulley of a starter generator, and with one the tensioning element of the traction device acting, with an assumed starter operation of the starter generator being understood as the traction area of the traction means which, viewed in the normal direction of rotation of the traction element disc of the starter generator, is arranged upstream of the traction element disc and the area of the traction element which is the empty strand is defined Traction device disc is subordinate.
Des Weiteren geht die Erfindung von der Erkenntnis aus, dass die aktuelle Position der Spanneinrichtung nach dem Abstellen der Brennkraftmaschine infolge der inneren Reibung der Brennkraftmaschine und der Nebenaggregate, sowie infolge von Vibrationen der Brennkraftmaschine während ihres Abstellvorganges nur sehr bedingt vorhersehbar ist und sich insofern eine an sich Undefinierte, an den generatorischen Betrieb angepasste Vorspannkraft im Zugmittel einstellt.Furthermore, the invention is based on the knowledge that the current position of the tensioning device after the internal combustion engine has been switched off, due to the internal friction of the internal combustion engine and the auxiliary units, and due to vibrations of the internal combustion engine during its shutdown process, can only be predicted to a very limited extent, and in this respect, one can be assumed Undefined pre-tensioning force in the traction device, which is adapted to the generator operation.
Erfindungsgemäß wird die Aufgabe nach dem vorgeschlagenen Verfahren nunmehr derart gelöst, dass der Zugmitteltrieb unmittelbar vor dem Startvorgang oder unmittelbar nach dem Abstellen der Brennkraftmaschine durch eine definierte Drehmomenteinleitung in denselben und entgegen seiner Normal- drehrichtung vorpositioniert wird.According to the invention, the object is now achieved according to the proposed method in such a way that the traction mechanism drive is pre-positioned in the same direction and counter to its normal direction of rotation immediately before the starting process or immediately after the internal combustion engine is switched off.
Durch diese Maßnahme wird insbesondere in den Leertrum des Zugmittels eine erhöhte Vorspannkraft eingebracht, die ihrerseits vorteilhaft einem herkömmlichen nachteiligen Abfall derselben in diesem Bereich während des Startbetriebs, und demgemäß einer verringerten Übertragung des Drehmoments von der Zugmittelscheibe des Starter-Generators auf die Zugmittelscheiben der übrigen Aggregate, insbesondere der Kurbelwelle der Brennkraftmaschine, vorbeugt.As a result of this measure, an increased pretensioning force is introduced in particular into the empty run of the traction means, which in turn advantageously benefits a conventional disadvantageous drop in this area during starting operation, and accordingly a reduced transmission of the torque from the traction element disc of the starter generator to the traction element discs of the other units , in particular the crankshaft of the internal combustion engine, is prevented.
In besonders vorteilhafter Ausgestaltung dieses Verfahrens ist vorgesehen, dass zur Vorpositionierung des Zugmitteltriebs mittels des Starter-Generators eine Drehbewegung der Zugmittelscheibe desselben entgegen der Normaldrehrichtung des Starter-Generators erzeugt und infolgedessen in den Leertrum des Zugmittels eine erhöhte Zugspannung eingebracht wird, die mit einer elastischen Dehnung des Zugmittels im Bereich des Leertrums einhergeht.In a particularly advantageous embodiment of this method, it is provided that for the pre-positioning of the traction mechanism drive by means of the starter generator, a rotational movement of the traction mechanism disc of the same against the normal direction of rotation of the starter generator is generated and consequently in the An empty strand of the traction device is introduced with an increased tensile stress, which is accompanied by an elastic expansion of the traction device in the region of the empty strand.
Eine durch die elastische Dehnung des Zugmittels im Bereich des Leertrums bewirkte Verlängerung des Zugmittels im Bereich des Zugtrums wird erfindungsgemäß durch die Spanneinrichtung ausgeglichen.An extension of the traction means in the region of the traction strand caused by the elastic expansion of the traction means in the region of the empty strand is compensated according to the invention by the tensioning device.
Dieses bedeutet in der Praxis, dass die durch die elastische Dehnung des Zugmittels im Bereich des Leertrums erzeugte Verlängerung desselben im Bereich des Zugtrums überführt wird und in der Folge die Zugmittelspannvorrichtung in den Zugmitteltrieb eindringt bzw. in diesen hineinschwenkt. Im An- schluss an den Ausgleich der Längenänderung des Zugtrums wird die Spanneinrichtung vorteilhafterweise in diesem Zustand fixiert.In practice, this means that the extension of the traction element produced by the elastic stretching in the region of the empty strand is transferred in the region of the traction strand and, as a result, the traction element tensioning device penetrates into the traction element drive or swivels into the latter. Following the compensation of the change in length of the strand, the tensioning device is advantageously fixed in this state.
Durch diese Maßnahme kann der aufgebaute Spannungszustand im Leer- und Zugtrum des Zugmittels definiert über einen längeren Zeitraum, also wenigstens bis zum nächsten Startvorgang und darüber hinaus gespeichert werden.This measure allows the tension state built up in the empty and traction strand of the traction device to be stored in a defined manner over a longer period of time, that is to say at least until the next starting operation and beyond.
Vorzugsweise sollte jedoch die Fixierung der Spanneinrichtung zumindest nach dem Start der Brennkraftmaschine wieder gelöst werden, da der erhöhte Spannungszustand des Zugmitteltriebs beziehungsweise des Zugmittels sich zwar vorteilhaft während der Startphase auswirkt, jedoch im Normalbetrieb der Antriebsanordnung der Zugmitteltrieb (Zugmittel, Lagerung der Zugmittel- und Umlenkscheiben) in diesem Zustand einem erhöhten Verschleiß unterliegen würde.However, the fixing of the tensioning device should preferably be released again at least after the internal combustion engine has started, since the increased tension state of the traction mechanism drive or of the traction mechanism has an advantageous effect during the starting phase, but during normal operation of the drive arrangement, the traction mechanism drive (traction mechanism, storage of the traction mechanism and deflection disks ) would be subject to increased wear in this state.
Des Weiteren ist zu gewährleisten, dass vorstehende Vorpositionierung des Zugmitteltriebs als Voraussetzung für einen jeden Neustart der Brennkraftma- schine reproduzierbar ist.Furthermore, it must be ensured that the above prepositioning of the traction mechanism drive is reproducible as a prerequisite for each restart of the internal combustion engine.
Die Vorrichtung zum Vorspannen eines Zugmitteltriebs einer Brennkraftmaschine zeichnet sich gemäß Anspruch 6 insbesondere dadurch aus, dass der Starter-Generator derart ausgebildet ist, dass mit diesem unmittelbar vor dem Startvorgang oder unmittelbar nach dem Abstellen der Brennkraftmaschine eine Drehbewegung der Zugmittelscheibe desselben entgegen der Normaldrehrichtung des Zugmitteltriebs erzeugbar und infolgedessen in den Leertrum des Zugmittels eine erhöhte Zugspannung einbringbar ist, die mit einer elastischen Dehnung des Zugmittels im Bereich des Leertrums einhergeht.The device for prestressing a traction mechanism drive of an internal combustion engine is characterized in accordance with claim 6 in particular in that the Starter generator is designed such that with this immediately before the starting process or immediately after switching off the internal combustion engine, a rotational movement of the traction device disk of the same against the normal direction of rotation of the traction device drive can be generated and, as a result, an increased tensile stress can be introduced into the empty run of the traction device, which has an elastic expansion of the traction device in the area of the empty run.
Nach einer ersten bevorzugten Ausführungsform ist der Starter-Generator zurAccording to a first preferred embodiment, the starter generator is for
Erzeugung der Drehbewegung der Zugmittelscheibe desselben entgegen der Normaldrehrichtung des Zugmitteltriebs entsprechend ansteuerbar ausgebildet.Generation of the rotational movement of the traction mechanism disc of the same is designed to be controllable counter to the normal direction of rotation of the traction mechanism drive.
Beispielsweise kann der Starter-Generator als Elektromotor durch einfache Umpolung kurzzeitig in eine von der Normaldrehrichtung abweichende entgegengesetzte Drehrichtung drehen und demgemäß eine bestimmte erhöhte Zugspannung auf den Leertrum des Zugmittels aufbringen.For example, the starter generator as an electric motor can briefly rotate in an opposite direction of rotation deviating from the normal direction of rotation by simple polarity reversal and accordingly apply a certain increased tensile stress to the empty run of the traction means.
Gemäß einer weiteren möglichen Ausführungsform kann dem Starter- Generator zur Erzeugung der Drehbewegung der Zugmittelscheibe desselben entgegen der Normaldrehrichtung auch ein separater und in die Zugmittel- scheibe oder deren Drehachse selbsttätig ein- und auskuppelbarer Antrieb zugeordnet sein.According to a further possible embodiment, the starter generator can also be assigned a separate drive which can be automatically engaged and disengaged into the tension means disk or its axis of rotation in order to generate the rotational movement of the tension means disk thereof counter to the normal direction of rotation.
Denkbar ist es beispielsweise, einen elektrisch betriebenen Linearantrieb mit einem an der Zugmittelscheibe oder der Drehachse derselben angreifenden Hebelsystem vorzusehen, wobei nur entgegen der Normaldrehrichtung der Zugmittelscheibe ein Formschluss zwischen besagtem Antrieb und der Zugmittelscheibe oder der Drehachse derselben realisiert wird, und in Normaldrehrichtung der Zugmittelscheibe sozusagen ein Freilauf realisiert ist.It is conceivable, for example, to provide an electrically operated linear drive with a lever system acting on the traction element disc or the axis of rotation of the same, whereby a form fit between said drive and the traction element disc or the axis of rotation thereof is realized only against the normal direction of rotation of the traction element disc, and in the normal direction of rotation of the traction element disc, so to speak a freewheel is realized.
Wie die Erfindung weiter vorsieht, ist die Spanneinrichtung derart ausgebildet, dass eine durch die elastische Dehnung des Zugmittels im Bereich des Leertrums bewirkte Verlängerung des Zugmittels im Bereich des Zugtrums ausgleichbar ist. Ferner wird vorgeschlagen, dass der Spanneinrichtung ein Fixiermittel zugeordnet ist, mit dessen Hilfe die Spanneinrichtung im Anschluss an den Ausgleich der Längenänderung des Zugtrums in diesem Zustand fixierbar ist.As the invention further provides, the tensioning device is designed in such a way that an extension of the traction means in the region of the traction strand caused by the elastic expansion of the traction means in the region of the empty strand can be compensated. It is also proposed that the tensioning device is assigned a fixing means, with the aid of which the tensioning device can be fixed in this state following the compensation for the change in length of the tension strand.
Das Fixiermittel kann erfindungsgemäß durch eine mechanische oder elektro- mechanische Verriegelung, oder durch eine gewählte Dämpfungscharakteristik der Spanneinrichtung gebildet sein.According to the invention, the fixing means can be formed by a mechanical or electromechanical locking device or by a selected damping characteristic of the tensioning device.
Schließlich wird vorgeschlagen, dass die Fixierung der Spanneinrichtung lösbar ausgebildet ist.Finally, it is proposed that the fixation of the tensioning device be releasable.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Die Erfindung wird im folgenden anhand der beiliegenden Zeichnungen an einigen Ausführungsformen näher erläutert. Darin zeigtThe invention is explained below with reference to the accompanying drawings of some embodiments. In it shows
Fig. 1 schematisch einen herkömmlichen Zugmitteltrieb einer Brennkraftmaschine und einem Starter-Generator in der Startphase, undFig. 1 shows schematically a conventional traction drive of an internal combustion engine and a starter generator in the starting phase, and
Fig. 2 einen erfindungsgemäß ausgebildeten Zugmitteltrieb während seiner Vorpositionierung vor dem eigentlichen Startvorgang der Brennkraftmaschine.2 shows a traction mechanism drive designed according to the invention during its prepositioning before the actual starting process of the internal combustion engine.
Detaillierte Beschreibung der ZeichnungenDetailed description of the drawings
Der in Fig. 1 gezeigte Zugmitteltrieb umfasst eine Zugmittelscheibe 1 einer Kurbelwelle einer Brennkraftmaschine, eine derselben in Normaldrehrichtung (Pfeil richtung) des Zugmitteltriebs nachgeordnete Zugmittelscheibe 2 eines Starter-Generators, sowie eine Umlenkscheibe 3 und eine Zugmittelscheibe 4 eines Nebenaggregates, wie z. B. eines Klimakompressors. Sämtliche Zugmittelscheiben 1, 2, 4 sowie die Umlenkscheibe 3 sind über ein Zugmittel 5, vorliegend ein Riemen oder eine Kette, miteinander verbunden.The traction mechanism shown in Fig. 1 comprises a traction sheave 1 of a crankshaft of an internal combustion engine, a traction sheave 2 of a starter generator arranged downstream thereof in the normal direction of rotation (arrow direction) of the traction mechanism drive, as well as a deflection sheave 3 and a traction sheave 4 of an auxiliary unit, such as, for. B. an air conditioning compressor. All traction pulleys 1, 2, 4 and the deflection pulley 3 are connected to one another via a traction means 5, in the present case a belt or a chain.
Gesetzt den Fall, dass sich die Antriebsanordnung in der Startphase bzw. der Starter-Generator im Starterbetrieb befindet, so sind, in Normaldrehrichtung der Zugmittelscheibe 2 (Pfeilrichtung) des Starter-Generators gesehen, bekanntermaßen der der Zugmittelscheibe 2 vorgeordnete Bereich als Zugtrum 6 (der in der Zeichnung links angeordnete Bereich des Zugmittels 5) sowie der der Scheibe 2 nachgeordnete und demgemäß rechts angeordnete Bereich des Zugmittels 5 als Leertrum 7 zu bezeichnen.Assuming that the drive arrangement is in the starting phase or the starter generator is in starter mode, the area upstream of the traction element disc 2 is known to be the traction strand 6 (the one in the normal direction of rotation of the traction element disc 2 (direction of arrow)) In the drawing, the area of the traction means 5) arranged on the left and the area of the traction means 5 arranged downstream and accordingly to the right of the pane 2 can be referred to as an empty strand 7.
Wie aus der Fig. 1 weiter ersichtlich ist, ist im Bereich des genannten Zugtrums 6 eine Spanneinrichtung 8 angeordnet, die ihrerseits als Axialspanner ausgebildet ist und sich einenends an einem nicht näher dargestellten tragenden Bauteil, beispielsweise dem Motorblock abstützt. Anderenends weist die Spanneinrichtung 8 eine federbelastete Spannrolle 9 auf, die sich ihrerseits am Zugmittel 5 abstützt, vorliegend am Zugtrum 6, und eine bestimmte Vorspannkraft auf das Zugmittel 5 aufbringt.As can also be seen from FIG. 1, a tensioning device 8 is arranged in the area of the mentioned strand 6, which in turn is designed as an axial tensioner and is supported at one end on a load-bearing component, not shown, for example the engine block. At the other end, the tensioning device 8 has a spring-loaded tensioning roller 9, which in turn is supported on the traction means 5, in the present case on the traction strand 6, and applies a certain prestressing force to the traction means 5.
Wirkt der Starter-Generator als Starter, so sind im Zugtrum 6 vergleichsweise hohe Kräfte zu verzeichnen, da beim Starten die Zugmittelscheibe 2 des Starter-Generators die Riemenscheibe 1 der Kurbelwelle und die Riemenscheibe 4 des Aggregates sowie die Umlenkscheibe 3 schleppt. Die so genannten Schleppmomente zum Anschleppen insbesondere der Kurbelwelle sind hierbei sehr hoch. Im Leertrum 7 treten dagegen geringere Kräfte auf. Im Ergebnis ist daher während des Starts des Starter-Generators zum einen ein Abfall der Vorspannkraft im Leertrum 7, und zum anderen ein Ausweichen der Spanneinrichtung 8 nach außen in Pfeilrichtung zu verzeichnen.If the starter-generator acts as a starter, comparatively high forces can be recorded in the pull strand 6, since when the starting means pulley 2 of the starter-generator drags the pulley 1 of the crankshaft and the pulley 4 of the unit as well as the deflection disk 3. The so-called drag torques for starting the crankshaft in particular are very high. In contrast, lower forces occur in the empty strand 7. As a result, a decrease in the pretensioning force in the empty strand 7 and, on the other hand, a deflection of the tensioning device 8 outward in the direction of the arrow can be observed during the start of the starter generator.
Wie bereits oben dargelegt, wirkt sich dieses Verhalten negativ auf die Weiterleitung des durch den Starter-Generator erzeugten Drehmomentes auf die Zugmittelscheiben 1 und 4 der übrigen Aggregate aus. Um diesem zu begegnen, wird erfindungsgemäß der Zugmitteltrieb unmittelbar vor dem Startvor- gang oder unmittelbar nach dem Abstellen der Brennkraftmaschine durch eine definierte Drehmomenteinleitung in denselben und entgegen seiner Normaldrehrichtung vorpositioniert.As already explained above, this behavior has a negative effect on the transmission of the torque generated by the starter generator to the traction element disks 1 and 4 of the other units. In order to counter this, the traction mechanism drive is invented immediately before the start gear or immediately after stopping the engine by a defined torque introduction in the same and against its normal direction of rotation.
Wie in Fig. 2 näher gezeigt ist, wird dazu beispielsweise mittels des Starter- Generators kurzzeitig eine Drehbewegung der Zugmittelscheibe 2 desselben entgegen der Normaldrehrichtung erzeugt; vorliegend demgemäß eine Drehbewegung entgegen dem Uhrzeigersinn (Pfeilrichtung).As is shown in more detail in FIG. 2, for this purpose, for example, the starter generator briefly produces a rotary movement of the traction element disk 2 counter to the normal direction of rotation; in the present case, accordingly, a counterclockwise rotation (arrow direction).
Der Starter-Generator ist gemäß einer bevorzugten Ausführungsform entsprechend ansteuerbar, indem dieser beispielsweise während der Startphase oder unmittelbar nach dem Abstellen der Brennkraftmaschine eine kurzzeitige Umpolung der Energieanschlüsse erfährt und somit als Elektromotor entgegen seiner üblichen Drehrichtung dreht. In der nachfolgenden Startphase wird die ursprüngliche Polung der Energieanschlüsse wieder hergestellt und der Starter-Generator kann die Brennkraftmaschine bestimmungsgemäß antreiben.According to a preferred embodiment, the starter-generator can be controlled accordingly by experiencing a brief reversal of the polarity of the energy connections, for example during the starting phase or immediately after the internal combustion engine has been switched off, and thus rotating as an electric motor counter to its usual direction of rotation. In the subsequent starting phase, the original polarity of the energy connections is restored and the starter generator can drive the internal combustion engine as intended.
Ebenso ist es denkbar und wird durch die Erfindung mit erfasst, dass dem Starter-Generator zur Erzeugung der Drehbewegung der Zugmittelscheibe 2 des- selben entgegen der Normaldrehrichtung ein separater und an die Zugmittelscheibe 2 oder deren Drehachse selbsttätig ein- und auskuppelbarer Antrieb zugeordnet ist (nicht näher dargestellt).It is also conceivable and is also covered by the invention that the starter-generator for generating the rotary movement of the traction element disc 2 is assigned a separate drive that can be automatically engaged and disengaged against the traction element disc 2 or its axis of rotation (not shown in more detail).
So kann beispielsweise ein elektrisch betriebener Linearantrieb mit einem an der Zugmittelscheibe oder deren Drehachse angreifendem Hebelsystem vorgesehen sein, der entgegen der Normaldrehrichtung der Zugmittelscheibe 2 einen Formschluss zwischen dem besagten Antrieb und der Zugmittelscheibe 2 oder deren Drehachse sowie eine kurzzeitige Drehbewegung entgegen der Normaldrehrichtung realisiert und in Normaldrehrichtung der Zugmittelscheibe 2 einen Freilauf aufweist. Durch vorstehende Maßnahmen kann vorteilhaft in den Leertrum 7 des Zugmittels 5 eine erhöhte Zugspannung eingebracht werden, die ihrerseits mit einer elastischen Dehnung des Zugmittels 5 im Bereich des Leertrums 7 einhergeht.For example, an electrically operated linear drive can be provided with a lever system acting on the traction mechanism disc or its axis of rotation, which, contrary to the normal direction of rotation of the traction mechanism disc 2, realizes a positive fit between said drive and the traction mechanism disc 2 or its axis of rotation and a brief rotary movement counter to the normal direction of rotation and in Normal direction of rotation of the pulley 2 has a freewheel. By means of the above measures, an increased tensile stress can advantageously be introduced into the empty strand 7 of the traction means 5, which in turn is accompanied by elastic expansion of the traction means 5 in the region of the empty strand 7.
Die elastische Dehnung des Zugmittels 5 im Bereich des Leertrums 7 bewirkt ihrerseits eine Längung des Zugtrums 6, also des vorliegend in der Zeichnung links angeordneten Bereiches des Zugmittels 5. Diese Längung des Zugtrums 6 wird durch die Spanneinrichtung 8 ausgeglichen, indem diese in Pfeilrichtung auf das Zugmittel 5 wirkt und dabei in den Zugmitteltrieb eindringt.The elastic expansion of the traction means 5 in the region of the empty strand 7 in turn causes an elongation of the traction strand 6, that is to say the region of the traction means 5 arranged on the left in the drawing. This elongation of the traction strand 6 is compensated for by the tensioning device 8 by moving it in the direction of the arrow onto the Traction means 5 acts and penetrates into the traction mechanism drive.
In diesem Zustand, der seinerseits insbesondere durch eine erhöhte Zugspannung im Leertrum 7 gekennzeichnet ist, ist es angezeigt die Spanneinrichtung 8 zu fixieren, um die erzeugte Vorspannung des Zugmitteltriebs beziehungsweise des Zugmittels 5 definiert über einen längeren Zeitraum aufrechtzuerhal- ten. Als Fixiermittel bieten sich bekannte und demgemäss nicht näher dargestellte mechanische oder elektromechanische Verriegelungen an.In this state, which in turn is characterized in particular by an increased tension in the empty strand 7, it is indicated to fix the tensioning device 8 in order to maintain the generated pre-tension of the tension means drive or the tension means 5 in a defined manner over a longer period of time. Known fixing means are available and accordingly not shown mechanical or electromechanical locks.
Ebenso ist es denkbar, die Dämpfungscharakteristik der Spanneinrichtung 8 derart zu wählen beziehungsweise einzustellen, dass eine entsprechende Fi- xierung des beschriebenen Zustandes gewährleistet ist.It is also conceivable to select or set the damping characteristic of the tensioning device 8 in such a way that a corresponding fixation of the described state is ensured.
Gesetzt den Fall, die Brennkraftmaschine soll neu gestartet werden, so wird der Starter-Generator zunächst als Elektromotor bzw. als Starter betrieben, der seinerseits die Brennkraftmaschine in Gang setzen soll. Dreht der Starter- Generator bzw. dessen Zugmittelscheibe 2 in Normaldrehrichtung, ist einem nachteiligen Abfall der Vorspannkraft im Leertrum 7 nunmehr vorgebeugt, da sich die Spanneinrichtung 8 noch im fixierten Zustand befindet, wodurch eine erhöhte Zugspannung im Zugmittel 5 gewährleistet ist.Assuming the case that the internal combustion engine is to be restarted, the starter generator is initially operated as an electric motor or as a starter, which in turn is to start the internal combustion engine. If the starter generator or its traction means disc 2 rotates in the normal direction of rotation, an adverse drop in the pretensioning force in the empty strand 7 is now prevented, since the tensioning device 8 is still in the fixed state, which ensures an increased tension in the traction means 5.
Um einem erhöhten Verschleiß des Zugmitteltriebs vorzubeugen ist es angezeigt, zumindest nach dem Start der Brennkraftmaschine die Fixierung der Spanneinrichtung 8 wieder zu lösen, wodurch sich der herkömmliche und ausreichende Spannungszustand des Zugmittels 5 für den Normalbetrieb erneut einstellt. Des Weiteren ist dadurch die Reproduzierbarkeit der erfindungsgemäßen Vorpositionierung des Zugmitteltriebs als Voraussetzung eines jeden Neustarts der Brennkraftmaschine gewährleistet.In order to prevent increased wear of the traction mechanism drive, it is advisable to release the fixation of the tensioning device 8 again at least after the internal combustion engine has started, as a result of which the conventional and sufficient tension state of the traction mechanism 5 is restored for normal operation established. Furthermore, this ensures the reproducibility of the prepositioning of the traction mechanism drive according to the invention as a prerequisite for every restart of the internal combustion engine.
Vorstehendes Ausführungsbeispiel stellt auf eine Spanneinrichtung 8 in Form eines inearspanners ab. Selbstverständlich können auch andere, an sich bekannte Spanneinrichtungen 8 erfindungsgemäß zur Anwendung kommen, beispielsweise so genannte Pendelspanner gemäß DE 100 45 143 A1, wodurch vorteilhaft eine Entlastung der Hebelarme durch eine Reduzierung der Kraft- spitzen zu verzeichnen ist. The above exemplary embodiment is based on a tensioning device 8 in the form of an inertial tensioner. Of course, other tensioning devices 8 known per se can also be used according to the invention, for example so-called pendulum tensioners according to DE 100 45 143 A1, which advantageously relieves the stress on the lever arms by reducing the force peaks.
Bezugszeichenreference numeral
Zugmittelscheibe (Kurbelwelle)Traction sheave (crankshaft)
Zugmittelscheibe (Starter-Generator)Traction sheave (starter generator)
Umlenkscheibedeflection plate
Zugmittelscheibe (Nebenaggregat)Traction sheave (auxiliary unit)
Zugmitteltraction means
Zugtrumdrive span
Leertrumloose side
Spanneinrichtungtensioning device
Spannrolle idler

Claims

Patentansprüche claims
1. Verfahren zum Vorspannen eines Zugmitteltriebs einer Brennkraftmaschine, mit einem zumindest die Zugmittelscheibe (1) einer Kurbelwelle und die Zugmittelscheibe (2) eines Starter-Generators verbindenden Zugmittel (5), sowie mit einer auf den Zugtrum (6) des Zugmittels (5) einwirkenden Spanneinrichtung (8), wobei bei einem angenommenen Starterbetrieb des Starter-Generators als Zugtrum (6) der Bereich des Zugmittels (5) verstanden wird, welcher in Normaldrehrichtung der Zugmittelscheibe (2) des Starter-Generators gesehen der Zugmittelscheibe (2) vorgelagert und als Leertrum (7) derjenige Bereich des Zugmittels (5) verstanden wird, welcher der Zugmittelscheibe (2) des Starter- Generators nachgeordnet ist, dadurch gekennzeichnet, dass der Zugmitteltrieb unmittelbar vor dem Startvorgang oder unmittelbar nach dem Abstellen der Brennkraftmaschine durch eine definierte Drehmomenteinleitung in denselben und entgegen seiner Normaldrehrichtung vorpositioniert wird.1. Method for prestressing a traction mechanism drive of an internal combustion engine, with a traction mechanism (5) connecting at least the traction mechanism pulley (1) of a crankshaft and the traction mechanism pulley (2) of a starter generator, and with a traction mechanism (5) on the traction strand (6) of the traction mechanism (5) acting tensioning device (8), with an assumed starter operation of the starter generator being understood as a traction strand (6) the area of the traction means (5) which, viewed in the normal direction of rotation of the traction means disc (2) of the starter generator, is upstream of the traction means disc (2) and An empty strand (7) is understood to be that area of the traction device (5) which is arranged downstream of the traction device disc (2) of the starter generator, characterized in that the traction device drive is immediately before the starting process or immediately after the internal combustion engine is switched off by a defined torque introduction in the same and prepositioned against its normal direction of rotation.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass zur Vorpositionierung des Zugmitteltriebs mittels des Starter-Generators eine Drehbewegung der Zugmittelscheibe (2) desselben entgegen der Normaldrehrichtung erzeugt und infolgedessen in den Leertrum (7) des Zugmittels (5) eine erhöhte Zugspannung eingebracht wird, die mit einer elastischen Dehnung des Zugmittels (5) im Bereich des Leertrums (7) einhergeht.2. The method according to claim 1, characterized in that for the pre-positioning of the traction mechanism drive by means of the starter generator, a rotational movement of the traction mechanism disc (2) of the same against the normal direction of rotation is generated and, as a result, an increased tensile stress is introduced into the empty run (7) of the traction mechanism (5) , which is accompanied by an elastic expansion of the traction means (5) in the region of the empty strand (7).
3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeich- net, dass eine durch die elastische Dehnung des Zugmittels (5) im Bereich des Leertrums (7) bewirkte Längung des Zugmittels (5) im Bereich des Zugtrums (6) durch die Spanneinrichtung (8) ausgeglichen wird. 3. The method according to any one of claims 1 and 2, characterized in that an elongation of the traction means (5) in the region of the traction strand (6) caused by the elastic expansion of the traction means (5) in the region of the empty strand (7) by the Clamping device (8) is compensated.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Spanneinrichtung (8) im Anschluss an den Ausgleich der Längenänderung des Zugtrums (6) in diesem Zustand fixiert wird.4. The method according to claim 3, characterized in that the tensioning device (8) is fixed in this state following the compensation of the change in length of the train strand (6).
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Fixierung der Spanneinrichtung (8) zumindest nach dem Start der Brennkraftmaschine wieder gelöst wird.5. The method according to claim 4, characterized in that the fixing of the tensioning device (8) is released again at least after the start of the internal combustion engine.
6. Vorrichtung zum Vorspannen eines Zugmitteltriebs einer Brennkraftma- schine, mit einem zumindest die Zugmittelscheibe (1) einer Kurbelwelle und die Zugmittelscheibe (2) eines Starter-Generators verbindenden Zugmittel (5), und mit einer auf den Zugtrum (6) des Zugmittels (5) einwirkenden Spanneinrichtung (8), wobei bei einem angenommenen Starterbetrieb des Starter-Generators als Zugtrum (6) derjenige Bereich des Zugmittels (5) verstanden wird, welcher in Normaldrehrichtung der Zugmittelscheibe (2) des Starter-Generators gesehen der Zugmittelscheibe (2) vorgeordnet ist, und als Leertrum (7) der Bereich des Zugmittels (5) definiert ist, welcher der Zugmittelscheibe (2) nachgeordnet ist, dadurch gekennzeichnet, dass der Starter-Generator derart ausge- bildet ist, dass mit diesem unmittelbar vor dem Startvorgang oder unmittelbar nach dem Abstellen der Brennkraftmaschine eine Drehbewegung der Zugmittelscheibe (2) desselben entgegen der Normaldrehrichtung des Zugmitteltriebs erzeugbar und infolgedessen in den Leertrum (7) des Zugmittels (5) eine erhöhte Zugspannung einbringbar ist, die mit ei- ner elastischen Dehnung des Zugmittels (5) im Bereich des Leertrums (7) einhergeht.6. Device for prestressing a traction mechanism drive of an internal combustion engine, with a traction mechanism (5) connecting at least the traction mechanism disc (1) of a crankshaft and the traction mechanism disc (2) of a starter generator, and with a traction mechanism (6) of the traction mechanism ( 5) acting tensioning device (8), with an assumed starter operation of the starter generator being understood as the traction strand (6) that region of the traction means (5) which, seen in the normal direction of rotation of the traction means disc (2) of the starter generator, of the traction means disc (2) is arranged upstream, and the area of the traction means (5), which is arranged downstream of the traction means disc (2), is defined as an empty run (7), characterized in that the starter-generator is designed in such a way that it is used immediately before the starting process or immediately after the internal combustion engine has been switched off, a rotational movement of the traction mechanism disc (2) of the same against the normal direction of rotation of the traction mechanism drive can be generated and as a result, an increased tensile stress can be introduced into the empty strand (7) of the traction means (5), which is accompanied by an elastic expansion of the traction means (5) in the region of the empty strand (7).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Starter-Generator zur Erzeugung der Drehbewegung der Zugmittelscheibe (2) desselben entgegen der Normaldrehrichtung entsprechend ansteuerbar ausgebildet ist. 7. The device according to claim 6, characterized in that the starter generator for generating the rotational movement of the traction means disc (2) is designed to be controllable counter to the normal direction of rotation.
8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass an dem Starter-Generator zur Erzeugung der Drehbewegung der Zugmittelscheibe (2) desselben entgegen der Normaldrehrichtung ein separater und an die Zugmittelscheibe (2) oder deren Drehachse selbsttätig ein- und auskuppelbarer Antrieb zugeordnet ist.8. The device according to claim 6, characterized in that on the starter generator for generating the rotary movement of the traction means disc (2) the same against the normal direction of rotation is assigned a separate and to the traction means disc (2) or its axis of rotation automatically engaged and disengaged drive.
9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Spanneinrichtung (8) derart ausgebildet ist, dass eine durch die elastische Dehnung des Zugmittels (5) im Bereich des Leer- trums (7) bewirkte Verlängerung des Zugmittels (5) im Bereich des Zugtrums (6) ausgleichbar ist.9. Device according to one of claims 6 to 8, characterized in that the tensioning device (8) is designed such that an extension of the traction means (5) brought about by the elastic expansion of the traction means (5) in the region of the empty strand (7) ) can be compensated in the area of the train strand (6).
10. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass der Spanneinrichtung (8) ein Fixiermittel zugeordnet ist, mit dessen Hilfe die Spanneinrichtung (8) im Anschluss an den Ausgleich der Längenänderung des Zugtrums (6) in diesem Zustand fixierbar ist.10. Device according to one of claims 6 to 9, characterized in that the tensioning device (8) is associated with a fixing means, with the help of which the tensioning device (8) can be fixed in this state following the compensation of the change in length of the strand (6) ,
11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass das Fixiermittel durch eine mechanische oder elektromechanische Verriege- lung, oder durch eine gewählte Dämpfungscharakteristik der Spanneinrichtung (8) gebildet ist.11. The device according to claim 10, characterized in that the fixing means is formed by a mechanical or electromechanical locking, or by a selected damping characteristic of the tensioning device (8).
12. Vorrichtung nach einem der Ansprüche 10 und 11, dadurch gekennzeichnet, dass die Fixierung der Spanneinrichtung (8) lösbar ausgebil- det ist. 12. Device according to one of claims 10 and 11, characterized in that the fixing of the tensioning device (8) is detachable.
PCT/EP2005/002045 2004-04-02 2005-02-26 Method and device for pretensioning a belt drive of an internal combustion engine WO2005106288A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05715572A EP1730420B1 (en) 2004-04-02 2005-02-26 Method and device for pretensioning a belt drive of an internal combustion engine
DE502005005400T DE502005005400D1 (en) 2004-04-02 2005-02-26 METHOD AND DEVICE FOR PREVENTING A CONVEYOR DRIVE OF AN INTERNAL COMBUSTION ENGINE
KR1020067020264A KR101140116B1 (en) 2004-04-02 2005-02-26 Method and device for pretensioning a belt drive of an internal combustion engine

Applications Claiming Priority (2)

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DE102004016353.7 2004-04-02
DE102004016353A DE102004016353A1 (en) 2004-04-02 2004-04-02 Method and device for biasing a traction mechanism drive of an internal combustion engine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1688643A3 (en) * 2005-02-05 2007-09-19 Schaeffler KG Linear tensioning device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005056418A1 (en) * 2005-11-26 2007-05-31 Schaeffler Kg Clamping device for a traction unit such as a belt or chain for machine parts comprises a bendable leaf or corrugated spring fixed to a lever arm which supports a clamping roller
DE102005059732A1 (en) * 2005-12-14 2007-06-21 GM Global Technology Operations, Inc., Detroit Variable-damping tensioner for drive belt has oil passages in piston with spools fitted close to them
KR100751574B1 (en) * 2007-03-02 2007-08-27 주식회사 신명엔지니어링 Air handling unit having automatic fan-belt adjuster
DE102009034339A1 (en) * 2009-07-23 2011-01-27 Bayerische Motoren Werke Aktiengesellschaft Auxiliary unit drive for internal combustion engine of motor vehicle, has crankshaft for driving auxiliary unit by traction drive, and overhauling device provided between crankshaft and traction drive, where overhauling device is shiftable
DE102010044864A1 (en) * 2010-09-09 2012-03-15 Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) Control of a variable tensioning device for a V-ribbed belt of a motor vehicle drive
KR101241209B1 (en) * 2011-01-06 2013-03-13 현대자동차주식회사 Belt system of hybrid vehicle
CN103307234B (en) * 2013-05-31 2015-11-25 西安应用光学研究所 Straddle-type adjustable steel V belt translation tensioning mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849886A1 (en) * 1998-10-29 2000-05-11 Bosch Gmbh Robert Belt drive, especially in internal combustion engines for driving auxiliary units of a vehicle
DE10045143A1 (en) * 2000-07-27 2002-02-07 Schaeffler Waelzlager Ohg Tensioning system for a belt-driven starter generator
DE10044645A1 (en) * 2000-09-08 2002-03-21 Schaeffler Waelzlager Ohg Traction drive, especially for driving internal combustion engine units, has arrangement for demand regulated setting of tension consisting of unit with housing with limited rotation and pulley

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19849886A1 (en) * 1998-10-29 2000-05-11 Bosch Gmbh Robert Belt drive, especially in internal combustion engines for driving auxiliary units of a vehicle
DE10045143A1 (en) * 2000-07-27 2002-02-07 Schaeffler Waelzlager Ohg Tensioning system for a belt-driven starter generator
DE10044645A1 (en) * 2000-09-08 2002-03-21 Schaeffler Waelzlager Ohg Traction drive, especially for driving internal combustion engine units, has arrangement for demand regulated setting of tension consisting of unit with housing with limited rotation and pulley

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1688643A3 (en) * 2005-02-05 2007-09-19 Schaeffler KG Linear tensioning device

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EP1730420A1 (en) 2006-12-13
KR20070010019A (en) 2007-01-19
KR101140116B1 (en) 2012-04-30
DE502005005400D1 (en) 2008-10-30
EP1730420B1 (en) 2008-09-17
DE102004016353A1 (en) 2005-10-27

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